Continuously growing urbanisation and the ongoing rebuilding of urban habitats affect amphibians, the most threatened vertebrate group. Even though the effects of urbanisation are mostly negative, some artificial components of the urban landscape may also display positive relationships with amphibian populations and therefore work in favour of their persistence in cities. Roosts provide protection from predation, desiccation and offer invertebrate prey availability; therefore, roost availability is an essential necessity of amphibian maintenance in urban areas. On the example of the European green toad Bufotes viridis, a typical urban dweller, we investigated roost-type occupancy and its distribution relative to a breeding pond during the active season (from June to October). The analysis was done with regard to the different life stages of individuals from three urban populations. Green toads used fissures situated in various man-made constructions (e.g., buildings, roads, pathways) for roosting cavities, however without any predominant pattern among toad life stages. The local architecture of the study sites mainly determined the type of occupied roosts. In adults and juveniles we recorded a gradually increased roost distance from breeding pond, while subadults were found roosting further from the water during the active season. Management measures aimed at maintaining a favourable state of green toad populations in urban environments should incorporate a complex of actions that consider general as well as the local ecological patterns of particular populations.

不断发展的城市化和城市栖息地的持续重建影响着两栖动物——最受威胁的脊椎动物群体。尽管城市化的影响大多是负面的，但城市景观的一些人工组成部分也可能与两栖动物种群表现出积极的关系，因此有利于它们在城市中的持久存在。栖息地提供了免受捕食、干燥的保护，并为无脊椎动物提供了猎物；因此，栖息地的可用性是城市地区两栖动物维护的必要条件。以欧洲绿蟾蜍 Bufotes viridis（一种典型的城市居民）为例，我们调查了活跃季节（六月至十月）栖息地类型及其相对于繁殖池的分布。该分析针对三个城市人口的不同生命阶段进行。绿蟾蜍利用各种人造建筑（例如建筑物、道路、小径）中的裂缝作为栖息地，但在蟾蜍生命阶段中没有任何主要模式。研究地点的当地建筑主要决定了栖息地的类型。在成鱼和幼鱼中，我们记录到栖息地与繁殖池的距离逐渐增加，而亚成鱼在活跃季节栖息地距离水面更远。旨在维持城市环境中绿蟾蜍种群的良好状态的管理措施应包括一系列综合行动，考虑到特定种群的一般生态模式和当地生态模式。